You might want to give the box generated by a [ code ] tag a fixed width, because since it's width is currently affected by the content inside, the #BPM line in somg song like Dream to Nightmare could stretch the page like it is now.

In my opinion, spoilers can also be used to hide large amounts of text and pictures that would make the thread long and annoying to scroll through. For these types of spoilers, I could suggest tags like:

[spoiler=text][/spoiler]

So an example of how this would appear in a post is:

Basically, the "Show Song List" spoiler has "Song List" as the text in the spoiler tag, and it makes the post easier to navigate as well as being more organized. Then when you click the spoiler, it'll display what is contained inside of it.

It's a suggestion that I personally think could allow for more organized posts and less clutter, that's all. The current spoilers could still be kept, just include the text in the tag to differentiate them (it would also give the hint that a black-covered spoiler is different from an information spoiler from say, a FAQ).